Thanks for playing!
As for the timer, we tried to make it less stressful by making 1 in-game second last 1.5 real-life seconds. We also show all of the cards before the fights, so players can take as much time as they want to read the effects, costs, and think about combos before starting.
For experimenting, we tried to make a pause menu with a restart button so you don't waste time but we couldn't due to time pressure.
That said, we appreciate the feedback, a practice mode without the timer is an interesting idea, and we'll keep it in mind. Thanks again for playing!